Method for controlling gear shifting in a hybrid driveline by use of an electric machine

Patent metadata

Field	Value
Publication number	US-2016264127-A1
Application number	US-201415032206-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Nov 21, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

A method to control a hybrid powertrain ( 2 ) in a vehicle, the powertrain including a combustion engine ( 3 ), an electric machine ( 4 ) and a gearbox ( 6 ) with an input shaft ( 10 ) and output shaft ( 18 ), wherein the combustion engine ( 3 ) and the electric machine ( 4 ) are connected to the input shaft ( 10 ). The method includes the steps of controlling the gearbox ( 6 ) to a neutral position; controlling the speed of the electric machine ( 4 ) to a predetermined speed, corresponding to a target speed for the input shaft ( 10 ) according to the next selected gear; engaging a gear in the gearbox ( 6 ); controlling the electric machine ( 4 ), so that the electric machine ( 4 ) accelerates or decelerates depending on a requested driving torque for the vehicle ( 1 ); detecting when a control signal for the electric machine ( 4 ) corresponds to a predetermined signal value; and controlling the electric machine ( 4 ) to the requested driving torque. Also, a hybrid powertrain and a vehicle ( 1 ), and a computer program (P) and a computer program product for performing the method are disclosed.

First claim

1 . A method to control a hybrid powertrain in a vehicle, wherein the powertrain comprises:
a combustion engine; an electric machine; a gearbox with an input shaft and an output shaft, wherein the combustion engine and the electric machine are connected to the input shaft; the method comprises the following steps: a) controlling the gearbox to a neutral position; b) controlling the speed of the electric machine to a predetermined speed, which corresponds to a target speed for the input shaft according to a next gear selected; c) engaging a gear in the gearbox; d) controlling the electric machine, to accelerate or decelerate depending on a requested driving torque for the vehicle; e) detecting when a control signal for the electric machine corresponds to a predetermined signal value; and f) controlling the electric machine to the requested driving torque.

2 . A method according to claim 1 , further comprising the step d) comprises controlling the electric machine with a predetermined torque limitation.

3 . A method according to claim 1 , further comprising before performing step a):
g) disconnecting the combustion engine from the input shaft via a coupling device.

4 . A method according to claim 1 , further comprising, before performing step f):
h) connecting and controlling the combustion engine to the requested driving torque, when the electric machine has achieved the requested driving torque or when a maximum torque for the electric machine has been achieved, if the maximum torque for the electric machine is lower than the requested driving torque.

5 . A method according to claim 1 , further comprising controlling the hybrid powertrain via an electronic control device.

6 . A hybrid powertrain, comprising elements configured and cooperating to perform and control the method according to claim 1 .

7 . A vehicle, comprising a hybrid powertrain according to claim 6 .

8 . (canceled)

9 . A computer program product, comprising a computer program for controlling a hybrid powertrain, the program stored in a non-transitory medium readable by a computer, the computer program comprises program code to cause an electronic control device or another computer connected to the electronic control device to cause performance of the method steps according to claim 1 , when the program code is executed in an electronic control device, or in another computer connected to the electronic control device.

Assignees

• Scania Cv Ab

Inventors

• Nilsson Mattias
• Sundén Fredrik
• Liwell Mats
• Kourie Afram

Classifications

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60K6/40

  characterised by the assembly or relative disposition of components · CPC title

• Y10S903/951

  Assembly or relative location of components · CPC title

• B60Y2200/92

  Hybrid vehicles · CPC title

• B60Y2300/19

  Improvement of gear change, e.g. synchronisation or smoothing gear shift · CPC title